Bi Mei, Yuan Le, Wang Xin, Weng Xiaolong, Deng Longjiang
Key Laboratory of Fluid and Power Machinery of Ministry of Education, School of Materials Science and Engineering, Xihua University Chengdu 610039 China
National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China Chengdu 610054 China.
RSC Adv. 2020 Jul 7;10(43):25639-25644. doi: 10.1039/d0ra02534h. eCollection 2020 Jul 3.
Micromagnetic simulations have been performed to investigate the magnetic textures and dynamic properties of FePt-based multilayer films. The uniform state, Neel skyrmion and Bloch skyrmion can be obtained using variable magnetic parameters. A microwave field is applied to induce spin precession along the out-plane and in-plane axes. For the perpendicular resonance modes, low-frequency peaks are identified as domain-wall modes. It is shown that radial-like and azimuthal-like resonance modes appear with increase in frequency. The excited modes are qualitatively different when the microwave field is applied along the in-plane axis. For the uniform state, the phase responds to the excitation with waves that spread out in a circle, which is a characteristic feature of the azimuthal mode in the spin wave. Because of the nonuniform effective field in Neel and Bloch skyrmions, the dynamic response localizes at the center and the edge spreads into the adjacent domains. These observations are important for tunable and abundant high-frequency magnetic properties in skyrmion-based devices.
已经进行了微磁模拟，以研究基于FePt的多层膜的磁织构和动态特性。使用可变磁参数可以获得均匀态、尼尔斯磁斯格明子和布洛赫磁斯格明子。施加微波场以诱导自旋沿面外轴和面内轴进动。对于垂直共振模式，低频峰被识别为畴壁模式。结果表明，随着频率增加，出现了径向和方位角状共振模式。当微波场沿面内轴施加时，激发模式在性质上有所不同。对于均匀态，相位以在圆周上传播的波响应激发，这是自旋波中方位角模式的一个特征。由于尼尔斯和布洛赫磁斯格明子中有效场的不均匀性，动态响应局限于中心，边缘扩展到相邻畴中。这些观察结果对于基于磁斯格明子的器件中可调谐且丰富的高频磁特性很重要。
